山东建筑大学学报2026，Vol.41Issue(2)：33-39,49,8.DOI:10.12077/sdjz.2026.02.004
三轴高周载荷下煤岩疲劳损伤破裂演化特征研究
Research on the evolution characteristics of coal fatigue damage fracture under triaxial high cycle load
摘要
Abstract
To investigate the effects of stress level and loading frequency on the evolution of fatigue damage and fracture in coal,triaxial high cycle load tests with acoustic emission(AE)monitoring were conducted.The AE responses and macro-meso fracture characteristics of coal under different conditions were analyzed.The results indicate that with a fixed lower-bound stress,a higher upper-bound stress leads to more significant fatigue crack development and more active AE responses.The specimen successively undergoes initial damage in the linear loading stage,followed by slight,moderate,and severe fatigue in the cyclic loading stage ultimately leading to failure.An increase in loading frequency accelerates the initiation,propagation and coalescence of microcracks,and significantly enhances AE activity,with the energy count rate and ringing count rate exhibiting highly synchronous variations.In contrast to conventional triaxial compression,coal under high cycle load presents multi-directional shear failure,with more complex crack distribution,more uniform fragmentation and more dispersed deformation at the microscale.AE parameters can effectively characterize the evolution process of fatigue damage in coal.关键词
岩石力学/煤岩/三轴高周载荷/声发射/疲劳破裂演化Key words
rock mechanics/coal/triaxial high cycle load/acoustic emission/fatigue fracture evolution分类
建筑与水利引用本文复制引用
邢鲁义,王超,陈海瑞,张国建,何天武..三轴高周载荷下煤岩疲劳损伤破裂演化特征研究[J].山东建筑大学学报,2026,41(2):33-39,49,8.基金项目
山东省自然科学基金项目(ZR2025QC575) （ZR2025QC575）
山东建筑大学博士科研基金项目(XNBS20116) （XNBS20116）
